automatic control system for electric water motor

7/30/2019 automatic control system for electric water motor

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“Automatic Control System For Electric

Water Pump For Use In Household Applications”

Under guidance of :

Prof. Dr. Bhupal Singh

Presented by:

Anjali OmerHuma ShireenLipika Jain



INTRODUCTION

This automatic control system for electric water pumpsenses the water level inside the tank and accordingly

turns on and turns off the motor.



WHY WE REQUIRE THIS ???

We require this because conventional method has

following drawbacks :

• involve human intervention

• no information about current water level in the tank

• require continuous monitoring

• wastage of water due to overflow



HOW DOES IT WORK ????

• It has following three sensors

1. High level sensor : determines whether tank is

full or not

: placed near top of tank 2. Low level sensor : determines whether tank is

empty or not

: placed near bottom of tank

3. Supply line sensor : determines whether water

is present in reservoir tank or not

: placed near the bottom of

tank



CONT………

• Output of these sensors is processed by a logiccircuit which works on the following logic

LLS HLS SLS Output

X X 0 Motor off

0 0 1 Motor on

1 0 1 Motor remains on

1 1 1 Motor off

1 0 1 Motor remains off

0 0 1 Motor again on

0 : water is not present1 : water is present



CONT……..

• Output of the logic circuit controls the triac whichin turn turns on and turns off the electric watermotor accordingly.



HOW CAN WE CONSTRUCT IT ????

• Materials required

Equipment Specifications Quantity Price (in Rs)

Electric water motor 2.5 W,50Hz,220V 1

Triac BT 137 1

Opamp IC 741,LM339 2

Transformer 220/12 V 1

nor Gate IC 7402 4 14

Resistors



CONT……

Equipment Specifications Quantity Price (in Rs)

Capacitors

npn Transistor IC 3904

Stainless steel electrodes

Wires

PCB Board 22

Solder



CONT…….

• Sensing Circuit

Case I: When water is not present



CONT….



CONT……

Case II: When water is present



CONT…..



CONT………

• Logic circuit

LLS HLS SLS Output

X X 0 Motor off

0 0 1 Motor on

1 0 1 Motor remains on

1 1 1 Motor off

1 0 1 Motor remains off

0 0 1 Motor again on




CONT………

• If we consider only LLS and HLS, then

LLS HLS Output

0 0 Motor on

1 0 Motor remains on

1 1 Motor off

1 0 Motor remains off

0 0 Motor again on




CONT………

• In short

LLS HLS Output

0 0 Motor on

1 0 No change in previous state

1 1 Motor off




CONT………

• If we invert the output of LLS then

• Above table is similar to the truth table for RS latchwhich is as follows:

LLS’ HLS Output

1 0 Motor on

0 0 No change in previous state0 1 Motor off

R S Q Q’ State

1 0 1 0 Reset

0 0 NC NC No change

0 1 1 0 Set



CONT…..

• Thus we have

HLS

LLS

RS latch using NOR gate

NOT gate

Q

Q’

LLS’



CONT…..

• Now we want

• This is possible if we invert the output Q’ such that

• Above can be realized using AND or OR gate

Q Q’ Output

1 0 1

0 1 0

Q Q’’ Output

1 1 1

0 0 0



CONT….

• Thus we have

HLS

LLS

RS latch usingNOR gate

Q

NOTgate

NOTgate

ANDgate

Q

Q’ Q’’



CONT…..

• Simplifying

HLS

LLS

Q



CONT……

• At last considering SLS

• This can be realized using AND gate

Q SLS Output

0 0 00 1 0

1 0 0

1 1 1



CONT…..

• Thus finally we have

HLS

LLS

SLS

RS latch usingNOR gate

Q

NOTgate

NOT gate

AND

gate



CONT……

• Final Circuit



Software SimulationUsing NI Multisim 12.0



Water is present in water supply line

• Case I: Tank is full

SLS HLS LLS




• Case II: User starts using water

SLS HLS LLS




• Case III: Tank is empty

SLS HLS LLS




• Case IV: Tank is partially filled with water

SLS HLS LLS




• Case V: Again tank is full

SLS HLS LLS



Water is not present in water supply line

SLS HLS LLS

X X



Physical Model



CONCLUSION & FUTURE WORK

• Thus we can conclude by saying that it will help in

efficient use of water in household applications andwill prevent the wastage of water, which is one of the major requirement for sustainabledevelopment.



Thank You !



Any Questions ????

automatic control system for electric water motor

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